GitHub actions

[brianz98]

This PR enables GitHub actions testing, and exposes a few more functions to the python side for future use.

[brianz98]

Just realized that we already had azure pipelines running.. if you think GHA is redundant @fevangelista feel free to close this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 23.20000% with 96 lines in your changes missing coverage. Please review.

Project coverage is 80.08%. Comparing base (a6f7b59) to head (8d87d86).

Files	Patch %	Lines
...d/diagrams/wick_theorem_elementary_contractions.cc	3.57%	81 Missing ⚠️
wicked/helpers/orbital_space.cc	0.00%	5 Missing ⚠️
wicked/algebra/equation.cc	0.00%	4 Missing ⚠️
wicked/algebra/index.cc	0.00%	2 Missing ⚠️
...cked/diagrams/wick_theorem_process_contractions.cc	87.50%	2 Missing ⚠️
wicked/algebra/symbolic_term.cc	0.00%	1 Missing ⚠️
wicked/api/wick_theorem.cc	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   83.92%   80.08%   -3.85%     
==========================================
  Files          48       48              
  Lines        1873     1973     +100     
==========================================
+ Hits         1572     1580       +8     
- Misses        301      393      +92     

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